Reflector arch for furnaces



J 3i, 192s. Y 1,678,816-

J. B. KENAHAN REFLEGTOR ARCH FOR FURNCES limes E KL'nd-a. n

july 3l, 1928. A 1,6789816 J. B. KHNAHAN I REFLECTOR ARCH Fon FURNAcEs Filed June 6, 1925 2 sheets-sheet I 2 I l @L INVENTOR.

JLmesBKna-ha-w atentecl `luly 31, 1928.

narran STATES JAMES B. KlNAHAN, OF DETROIT, MICHIGAN.

REFLECTOR ARCH FUR-NACES.

Application led June 6,

My invention relates to a new and useful improvement in a reflector arch, adapted for use as a boiler or furnace arch, and is in-v tended to provide an arch having vdouble reflecting surfaces for reflecting the heat rays downwardly onto the fuel, as the same is delivered to the fireboX. The arch, as shown in the drawings and described in the specifications, provides a reflector arch which may be quickly and easily assembled, being so constructed as to permit the removal and replacement of a damaged or wornout block without disturbing, to any great extent, the surrounding blocks.

1n the construction of the arch, as Aillustrated, the blocks forming the arch are so constructed and hung, as to permit free and easy movement of the blocks in response to expansion and contraction. y'The blocks are preferably set into position in free condition with the absence of binding material between the side walls thereof, so that, as the eXpansion and contraction takes place, there is no binding material to retard the movement of the blocks in response to variations of surrounding temperatures.

Another feature of the invention is the provision of an end unit ofblocks which permits the expansion of the arch throughout its length' and assures the movement of the arch to normal position upon contraction aft-er expansion. A similar feature with a different arrangement is provided for the opposite end of the arch, so that the matter of expansion and contraction on the arch is taken care of so as to provide an arch of the utmost efficiency and operable under all conditions.

Another feature of the invention is the method of hanging the blocks so as to support them in a substantially freely suspended position, to permit their movement in response to variations of surrounding temperatures. The special hangers provided, and the method of attaching the same to the blocks for the purpose of permitting this free movement is intended as an element in the present invention, the object being to provide a suitable hanger which will permit this expansion and at the same time afford a. ready and easy assembly of any of the blocks for replacementv with a minimum disturbance to the surounding blocks.

Another feature Iof the invention is the provision of a reflector arch so constructed as to minimize, to the greatest extent possible 1925. Serial No. 35,269.

carbonization and the collection of gases in Ycold corners.

Another feature of the structure is that a free circulation of all of the gases over the entire arch is permitted, owing to the lack of cold corners or catch places in or near the arch.

Other featuresl of the invention will appear hereinafter.

The invention consists in the combinations and arrangements of parts hereinafter described and claimed.

The invention will be best understood from a reference to the accompanying drawings, which form a part of this specification and in which,

F 1 is a section through an arch, illustrating a side elevational view of one of the units, I y Fig. 2 is a sectional view taken on substantially line 2 2 of Fig. 1,

Fig. 3 is a sectional view taken on substantially line 3 3 of Fig. 1,`

` Fig. l is a side elevational view of one of the blocks used in the invention,

F 1g. 5 is a front elevational view of one of the blocks used in the invention,

Fig. 6 is a sectional view illustrating a hanger used' in the invention,

Fig. 7 is a side elevational view-of the hanger shown in Fig. 6, f

Fig. 8 is a side elevational view of' a hanger used in the invention,

Fig. 9 is an end elevational View of the hanger shown in Fig. 8,

I Fig. 10 is a side elevational view of a modified form of hanger used in the invention,

`Fig. 11 is an end elevational view of the hanger shown in Fig. 10,

Fig. 12 is a side elevational view` of a hanger used with thatshown in Fig. 10,

Fig. 13 is an end elevational view of a special vhanger',

, Fig. 14 is a side elevational view of the hanger in Fig. 13. y l

The arch comprises a mainvbody, which is downwardly inclined toward the forward wall 15 of the boiler, or furnace, withwhich used. This portion of the arch is comprised of a plurality of blocks 16 and 17. Each of these blocks Ais provided with a recess 18-hav ing a socket 19 communicating therewith at the lower end. As shown in Fig. 5, the re cess 18 has side walls which converge adjacent the formation of the socket 19. These blocks also are provided with inclined shoulder walls 2O and 20, as shown inFig. 1 and Fig. 5.

The type of furnace with which the arch is primarily used is that type of furnace having a forward wall 21, projecting outwardly is suitably supported at its opposite ends,

these -beams being out of alinement so as to support inclined I beams 24, which support transversely extending angle irons 25, the

. number ofthe eyebeams 24 being determined by the width of the boiler or furnace with which used. Engaging with the angle irons 25 is a hooked portion 26 which projects from a cylindrical tubular portion 27, this hanger being formed preferably from a single casting. Projected through the bore of the portion 27 and provided with a `suitable nut to retain the same therein is a bolt 28, the opposite end of which is projected through an opening formed in the hanger 29, said opening communicating with a passageway 30fwhich communicates with an enlarged central opening 31. ln alinement with the passage 30 isa passageway 32 communicating with an opening in which is positioned one end of a hook 33, having a nut threaded thereon. rlhe hooked 'end of the hook engages in an opening 34 formed in the upper end of the hanger 35, shown in Fig. 8. The hanger 35 is provided, at its lower end, with laterally extending arms 36 and 36', each of said arms being adapted for engaging in the socket 19 formed in adjacent blocks, so that each hanger will support a double row of blocks 16. The blocks 17 are each provided, at its upper end, with a flanged portion having a beveled undersurface 37 adapted for engagingthe shoulder forming surface 2O and 20 of the block 16, so that the block 16 will serve to support the block 17 in position. ,Similar hangers are engaged by the hooks 33 which project through laterally extending lugs 86 on the hanger 29. It is evident that a removal of one of the blocks, either 16 or 17 may be easily and quickly accomplished by raising the proper hangers so as to remove the blocks 16 with whichr the block 17 engages. vThe forward end of the forwardly downwardly inclined portion of the arch has an end block 38 which is formed in all respects similar to the block 16 at one side, the opposite side being terminated With a square connection inside of the shoulder forming surface 2O or 20. The opposite end of this portion of the arch is also provided with a block 38 similar to the block 38. Y The forward portionof the arch comprises a unit which is downwardly inclined more sharply than the main body of the arch. The innerend block 39 of this unit is supported by a hanger which projectsY sharply downwardly inclined portion of the arch, a cross bar 40 which has its end 40 angularly turned, is secured to the eyebeams 24, the cross bar 40 being so inclined as to permit the tubular portion 27 to be projected at an incline to the eyebeam 24, so that the bolt 28 which connects with the hanger 29 may be projected vertically toward the blocks 41 which form'the main portion of this unit. These blocks are each provided'at adjacent faces with a groove already mentioned and with the sockets communicating with the groove for the reception of the laterally extending arms 36 and 36', which project from the end of the hanger 35. An end block 42 .is provided for this arch, which is supported by a projection of the forward wall 15. The block 42 is not permitted to lie directly upon the inward projection 1,5 of the forward wall, but is positioned upon a layer 43 of mineral wool, a packing 44 ofA asbestos, or other suitable material serving to space the faceof the block 42 from the wall,

this packing 44 projecting over the upper surface of the block, as shown in Fig. 1.

The inner end of the arch is provided with al unit to permit the termination of the arch at substantially the inner surface of the furnace wall. In order to terminate this arch at this point and to eliminate the formation of any pockets orcold corners, and at the same time, to provide for expansion and contraction of the arch, a special unit is constructed comprising the blocks 45, 46 and 47. These blocks are each provided with a socket for receiving a laterally extending arm which projects from a hanger arm 48, this arm 48 being secured to a hanger plate 49 by means of a bolt 50 projected through an opening 51 or 51 in the plate 49. lAs shown in Figs. 6 and 7, these openings y51 and 51 are angularly spaced from the lower edge of the plate 49, so as to permit of the attachment of the hangers to the blocks atfthe proper direction of projection. As shown vin Fig. 1, one of the hanger arms ,'52 is provided with a laterally projecting arm 52 from onel side only, the other hanger 48 being provided with. laterally extending arms from both sides.

49, a suitable boltbeing provided to bind these plates together, the upper end of said plates being formed substantially U-shaped, so as to embrace the flange, at opposite. sides of the I-beam 53, which is connected to the I-beam 22 at one end and projected yinto the front wall of the boiler at its opposite end serving `to support 'this front wall 21. Suitable roller bearings 54 are mounted on the flanges of the l-beams, so as to be en- As shown in Fig.. 6,' thereis associated with the plate 49 a plate gaged by theU shaped Iportions of the .members 49 and 49. Positioned `beneath the lower surface of the wall 21 and the upper surface of the block 47 is a layer 55 of suitable packing, such as asbestos, which will permit compression under pressure, and have a tendency to resume its normal position upon release of thepressure. A suitable block 56, made 4from lirebrick, or other suitable material, is mounted von `the extreme outer end of the yblock 47, so that, when the compression of the asbestos takes place, the block 56 will serve to compress the outer portion of the asbestos more than the inner portion ofthe asbestos. The connection of the hanger plate 49 with the lower liange of the I-beam 53 is such that the blocks 45, 46 and 47 may move relatively to the I-beam, the plate 49 and its co-operating plate 49 i moving on the roller bearings 54. As eX- pansion takes place, the main body of the arch comprised of the blocks 16 and 17 will force the unit comprising the blocks 45, 46 and 47 to move so as to compress the asbestos 55. When the temperature is lowered, so that a contraction of the main body of the arch takes place, the pressure of the asbestos against the upper\surface of the block 47 against the brick 56 will cause the blocks 45, 46 and 47 to move to their normal position. Positioned between the I-beams 24, so as to engage the lower surface of the wall 21, are cast iron plates 57, these plates being adapted to engage the flanges of the I-beams,

1 as'shown in the drawings.

Ilfhen the expansion of the blocks takes place, it is clear that the bolts 28, the hanger 29 and the hooks 33 will remain in substantially their normal positions. Consequently, a swinging movement of the blocks 16 takes place relatively to the hanger which engages the blocks. p

The recess or groove 18 is so arranged as to permit this swinging `movement of the hanger relatively to the blocks` There is thus permitted a free movement of the blocks, so that the expansion and contraction may be freely had.

rIhe mineral wool 43 serves as a foundation for the block 42A and the asbestos 54 engages the face of. the block 42 and serves to permit expansion and contraction of the unit made up from the blocks 41. These blocks 41 are contructed similar to the blocks 16, their position of mounting being transverse to the postion of mounting the blocks 16. The unit made up from the blocks 41 is inclined in the manner shown, so as to eliminate any sharp corners, in which the gases may collect, or carbonization takes place.

It is intended, in constructing the arch, to have the blocks of uniform size and form throughout, the various forms indicated comprising the different types in view, al-

though special ,structures may be required where a lslightly .different form of block may' be needed. For the bulk of the work in constructing arches ofV this type, however, uniform blocks are intended, and the `filler blocks 17 may be varied in size where it is necessary to yproperly construct the ,a-rch.

In this way, ,a smaller filler block 17 Vmay be used in a narrow space, without, in any way, altering the size o r ,shape ,of the hanger blocks.

In constructing the blocks 45, 46 and 47, which make up the end unit, the recess or groove of the face is made deeper than in the blocks 16, so that hangers which support these blocks 45, 46 and 47 engage lthe blocks at or about their longitudinal transverse center. This arrangement affords a more desirable connection with these blocks and permits a free movement of the same in response to contraction and expansion.

The modified form of hanger which is shown in Fig. 10 is used in low places where the supporting beams are placed close to the upper surface of the arch. The bolt 28 is attached to its center and less room is required for mounting this hanger owing to its relative position to the upper surface of the arch, the at surface lying in a plane to ltlhe plane of the upper surface of the arc In a furnace of this class, I have provided, as set out above, an arch adapted for bringing about the results desired; It is apparent that there are no pockets in which gases may collect, and that kthe arch is a double reflecting arch having the two surfaces angularly inclined to the fuel which is fed into the furnace beneath the arch. The reflectory arch is particularly adapted for furnaces in which pulverized fuel is used, although its advantages will be present when other fuel is used.

In the claims, the term furnace has been used, but it is apparent from this specification, that this term is intended to embrace heating plants of various kinds, such as melting furnaces, steam generating furnaces, etc.

While I have illustrated and described the preferred form of structure, I do not wish to limit myself to the precise details of structure set forth but desire to avail myself of such variations and modifications as come within the scope of the appended claims.

Having thus described my invention, what I claim asnew and desire to secure by Letters Patent is:

1. In a furnace arch of the class described, a hanger comprising a main body having a central opening formed therein and pro- 2. In a furnace arch of the class described, a hanger, comprising a main body having a central opening formed therein, and provided with a pair of diametrieally opposite openings leading into said central opening;

a hanger arm rotatably mounted on said main body in each of the said openings and projecting outwardly therefrom.

3. In a furnace arch of the class described, a hanger7 comprising a main body having a central opening formed therein, and pro vided with a pair of diainetrically opposite openings leading into said Central opening; a hook-bearing arm mounted on said main body in each of the said openings and pro jecting outwardly therefrom; a pair of lugs projecting outwardly from opposite sides of said main body and a hanger arm rotatably mounted in each of said lugs.

In testimony whereof, VI have signed the 20 foregoing specification.

' JAMES B. KINAHAN. 

